Gardenia stenophylla embodies yin energy, believed to facilitate introspection and tranquility. As per Feng Shui tradition, this plant fosters emotional balance, particularly in northern-facing rooms. The reasoning being North symbolizes Water in Feng Shui element theory, and this plant harmonizes well with this Water element. However, the effect upon an individual's space may differ due to personal elements and circumstances.

The mountain doghobble is thought to harmoniously align with Eastern-facing directions. As Feng Shui principles associate East with the element of Wood and the color green - both intrinsically linked to plants - mountain doghobble may potentially thrive in such orientation. However, please remember Feng Shui's interpretative nature and the diverse external influences that can impact this arrangement.

The rusty blackhaw harmonizes well with an East-facing direction due to its vibrant, resilient nature. Respected Feng Shui practitioners often value this plant for its ability to draw life force energy, or 'Qi', contributing to a balanced, tranquil environment. However, the understanding of Feng Shui differs across individuals, thus this suggestion may not resonate with everyone.

The Samurai orchid (Vanda falcata), henceforth referred to as samurai orchid, is viewed as moderately compatible with Feng Shui principles. Paired particularly with the East-facing direction, samurai orchid is believed to nourish harmonious energy, since East is the symbol of rebirth and renewal, which can mirror the orchid's efflorescence cycle. Note that such interpretations could vastly differ among diverse schools of Feng Shui.

The japanese white pine is known for its resilience and sublimity, considered to possess the essence of Yang energy in Feng Shui. It exhibits a harmonious relationship when positioned in a Northwest facing direction. The reason lies in the belief that Northwest aligns with the Metal element, which nourishes the Wood element embodied by the japanese white pine. However, the interpretation of Feng Shui varies, and personal experiences play a crucial role.

The prairie coneflower aligns harmoniously with Feng Shui principles. Its buoyant yellow hues enhance the energy of the South direction, commonly associated with recognition and fame. The golden blossom is believed to channel the element of fire that governs the South, intensifying vivaciousness and positivity. Remember, Feng Shui interpretations do vary and hence, individual experiences can differ.

The organ pipe cactus exhibits a fair compatibility with Feng Shui principles, considering its sharp and tall growth forms that suggest a certain potent energy. Generally, it suits the Northeast direction, a sector associated with knowledge and self-growth, possibly due to the plant's resilience and strong will to survive in arid conditions. However, interpretation varies based on personal relationships with the plant, space, and Feng Shui practices.

In Feng Shui, the chinese aloe fits supportively in spaces pointing to the North. The plant's verdant vitality is believed to balance the Water element predominant in the North, promoting equilibrium and energy flow. However, like all Feng Shui concepts, the harmony chinese aloe brings depends on the specificities of the space and individual.